Semiconductor integrated circuit device and motor system

Abstract

A semiconductor integrated circuit device includes: a first terminal configured to receive a first voltage; a part of a charge pump circuit configured to output a second voltage obtained by stepping down the first voltage received from the first terminal; at least a part of a linear power supply circuit configured to output a third voltage obtained by stepping down the second voltage received from the charge pump circuit; an internal circuit configured to use the third voltage received from the linear power supply circuit as a power supply voltage; a second terminal configured such that a first end of an external resistor included in the charge pump circuit is connected to the second terminal; and a third terminal configured such that a second end of the external resistor is connected to the third terminal.

What is claimed is: 
     
         1 . A semiconductor integrated circuit device comprising:
 a first terminal configured to receive a first voltage;   a part of a charge pump circuit configured to output a second voltage obtained by stepping down the first voltage received from the first terminal;   at least a part of a linear power supply circuit configured to output a third voltage obtained by stepping down the second voltage received from the charge pump circuit;   an internal circuit configured to use the third voltage received from the linear power supply circuit as a power supply voltage;   a second terminal configured such that a first end of an external resistor included in the charge pump circuit is connected to the second terminal; and   a third terminal configured such that a second end of the external resistor is connected to the third terminal.   
     
     
         2 . The semiconductor integrated circuit device of  claim 1 , further comprising an output stage configured to use the first voltage received from the first terminal as a power supply voltage. 
     
     
         3 . The semiconductor integrated circuit device of  claim 1 , wherein the charge pump circuit includes a switching circuit configured to switch between short-circuit and non-short-circuit between the second terminal and the third terminal. 
     
     
         4 . The semiconductor integrated circuit device of  claim 3 , further comprising a switching control circuit configured to control the switching circuit based on the second voltage. 
     
     
         5 . The semiconductor integrated circuit device of  claim 4 , wherein the switching control circuit is configured to switch from the non-short-circuit to the short-circuit between the second terminal and the third terminal when the second voltage falls below a predetermined value. 
     
     
         6 . The semiconductor integrated circuit device of  claim 1 , further comprising a charging and discharging control circuit configured to control charging and discharging of a capacitor included in the charge pump circuit based on the second voltage. 
     
     
         7 . The semiconductor integrated circuit device of  claim 1 , further comprising a current source connected to the second terminal. 
     
     
         8 . The semiconductor integrated circuit device of  claim 2 , wherein the internal circuit includes a control circuit configured to directly or indirectly control the output stage. 
     
     
         9 . The semiconductor integrated circuit device of  claim 8 , further comprising a pre-driver,
 wherein the control circuit is configured to indirectly control the output stage via the pre-driver, and   wherein the pre-driver is configured to use the first voltage received from the first terminal or a voltage obtained by boosting the first voltage as a power supply voltage.   
     
     
         10 . The semiconductor integrated circuit device of  claim 2 , further comprising a control circuit configured to indirectly control the output stage via a pre-driver,
 wherein the internal circuit includes the pre-driver.   
     
     
         11 . The semiconductor integrated circuit device of  claim 10 , wherein the internal circuit includes the control circuit. 
     
     
         12 . A motor system comprising:
 a motor; and   the semiconductor integrated circuit device of  claim 1  configured to drive the motor.